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Full Discussion: Script Works But Need It to Exit Upon Closing Program
Top Forums Shell Programming and Scripting Script Works But Need It to Exit Upon Closing Program Post 303031783 by jakefish on Tuesday 5th of March 2019 08:26:12 PM
Old 03-05-2019
Code:
tail

In my searches about this original script, I had read about tail, but had not seen as clear an example as yours. That is, unfortunately, an issue with general googling. Before coming here, I did due diligence troubleshooting this script, and never did find the kind of explanations that you're providing. Either I'm googling the wrong words or their algorithm isn't sophisticated enough to generate a response beyond "Here's a script."

Code:
paste <(cut -f1 file1) <(cut -f3 file2) | tee >(process1) >(process2)

I've obviously bookmarked this thread, with the hopes of returning to it to fix future problems. Since I'm no mathematician or a user of spreadsheets beyond subject-note, my scripting issues mostly lie in the realm of how things are displayed on the screen, window title bars, genmon outputs, etc.

In light of that, I was wondering if you had the energy to explain the use of an ampersand.

Code:
( sleep 1
  while pgrep google-chrome-stable
    do  xdotool search --name Chrome 2>/dev/null | 
        while read id
           do xdotool set_window --name "Chrome" $id
           done
        sleep 1
    done
 ) &
google-chrome-stable

This script worked and because of this helpful thread, I understand why it did. I understand that the amperstand used in the line ") &" essentially says the "while" stuff will run in the background as long as "google-chrome-stable" runs in the foreground.

Okay. But what happens if a user wants to add something in between:

Code:
#!/bin/sh
( sleep 1
  while pgrep links
    do  xdotool search --name links 2>/dev/null | 
        while read id
           do xdotool set_window --name "Links2" $id
           done
        sleep 1
    done
 ) &
xlinks2 &
sleep .2
wmctrl -a "Links2"
sleep .2
wmctrl -r :ACTIVE: -b toggle,maximized_vert,maximized_horz
sleep .2
xdotool key s &

[the issue at hand: Links2 doesn't start maximized and clicking "s" brings up its bookmarks]

I could not get the maximization/bookmarks commands to run until I added strategic single ampersands. Without the ampersands, the wmctrl/xdotool commands don't run until after xlinks2 is closed, defeating their purpose.

If the "while" script runs in the background, xlinks2 runs in the foreground, but I don't yet understand how subsequent ampersands *also* seem to drop xlinks2 into the background; nor do I understand why the wmctrl/xdotool commands execute themselves directly on xlinks2 rather than on the "while" script or on some other window [which I have seen happen in previous failed scripts].

Feel free to beg off this thread at any time. The final script of this thread works perfectly; I'm posting for the sake of my continued erudition, or perhaps someone else's, should s/he be lucky enough to stumble here.
 

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LEARN ABOUT OSX

locale::codes::script

Locale::Codes::Script(3pm)				 Perl Programmers Reference Guide				Locale::Codes::Script(3pm)

NAME

       Locale::Codes::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Codes::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Codes::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. A code set may be specified using either a name, or a constant
       that is automatically exported by this module.

       For example, the two are equivalent:

	  $script = code2script('phnx','alpha');
	  $script = code2script('phnx',LOCALE_SCRIPT_ALPHA);

       The codesets currently supported are:

       alpha, LOCALE_SCRIPT_ALPHA
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.  It also includes additions to this set
	   included in the IANA language registry.

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       num, LOCALE_SCRIPT_NUMERIC
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Codes::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Codes::Script::delete_script  ( CODE [,CODESET] )
       Locale::Codes::Script::add_script_alias	( NAME ,NEW_NAME )
       Locale::Codes::Script::delete_script_alias  ( NAME )
       Locale::Codes::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::delete_script_code_alias	( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.unicode.org/iso15924/
	   Home page for ISO 15924.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11						Locale::Codes::Script(3pm)
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